Spanner is a practical tool, totally free, that will allow you to chop those files that have a very large size into much smaller and manageable fragments.
The Spanner user can specify how large each of the resulting fragments will be, as well as what will be the destination folder in which all will be located, once divided. In addition, it allows to process the division of the files in batches and, likewise, to impose a security password to access the data.
To use Spanner you need to have previously installed Visual Basic Runtime 6.0 or higher.
You can free download Spanner 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.